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Surface and structural analysis of epitaxial La 1− x Sr x (Mn 1− y Co y ) z O 3 films
Author(s) -
Kaciulis Saulius,
Bolli Eleonora,
Mezzi Alessio,
Vagner Milita,
Plausinaitiene Valentina,
Kersulis Skirmantas,
Zurauskiene Nerija,
Lukose Rasuole
Publication year - 2020
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.6767
Subject(s) - x ray photoelectron spectroscopy , magnetoresistance , analytical chemistry (journal) , epitaxy , ferromagnetism , lattice constant , chemical vapor deposition , materials science , magnetization , diffraction , chemistry , condensed matter physics , nuclear magnetic resonance , magnetic field , nanotechnology , physics , quantum mechanics , chromatography , layer (electronics) , optics
In the present study were studied the ferromagnetic La 1− x Sr x (Mn 1− y Co y ) z O 3 (LSMCO) films with Co content y = 0 to 0.18, grown on LaAlO 3 substrates by advantageous pulsed‐injection metalorganic chemical vapor deposition technique. The LSMCO films exhibit negative colossal magnetoresistance effect; therefore, they are interesting as potential material for the applications in magnetic field sensing. The changes of lattice volume in the investigated LSMCO films were monitored by X‐ray diffraction measurements revealing a transition from tensile to compressive strain with increase of Co content. Additionally, from the atomic force microscopy images, the surface smoothening with increase of y was determined. Despite the reduction of the out‐of‐plane lattice parameter of LSMCO, the increase of lattice volume in the whole Co‐doping range was observed. The X‐ray photoelectron spectroscopy combined with Ar + ion sputtering was used for the investigation of chemical composition of the LSMCO films and demonstrated the change and redistribution of oxidation states of Mn and Co on the surface and in the volume of the films. Regardless of the structural changes and charge distribution of Co and Mn cations, epitaxial LSMCO exhibits ferromagnetic properties and magnetoresistance values increases with augmenting Co content in the range of y = 0 to 0.18.

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